Wat dacht je zelf is a common Dutch expression used in everyday conversation as a rhetorical comeback, similar to saying of course or what did you expect in English. As a soundboard clip it spread through Dutch meme pages, group chats and short video edits where a short spoken reaction is more effective than typing a reply. Its popularity comes from how recognizable the phrasing is to Dutch speakers and how easily it fits gaming fails, obvious reveals and sarcastic comment threads without needing any context from a film or show.